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# encoding: utf-8
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"""
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An embedded IPython shell.
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"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from __future__ import with_statement
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from __future__ import print_function
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import sys
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import warnings
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from IPython.core import ultratb, compilerop
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from IPython.core.magic import Magics, magics_class, line_magic
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from IPython.core.interactiveshell import DummyMod
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from IPython.terminal.interactiveshell import TerminalInteractiveShell
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from IPython.terminal.ipapp import load_default_config
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from IPython.utils.traitlets import Bool, CBool, Unicode
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from IPython.utils.io import ask_yes_no
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# This is an additional magic that is exposed in embedded shells.
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@magics_class
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class EmbeddedMagics(Magics):
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@line_magic
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def kill_embedded(self, parameter_s=''):
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"""%kill_embedded : deactivate for good the current embedded IPython.
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This function (after asking for confirmation) sets an internal flag so
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that an embedded IPython will never activate again. This is useful to
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permanently disable a shell that is being called inside a loop: once
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you've figured out what you needed from it, you may then kill it and
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the program will then continue to run without the interactive shell
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interfering again.
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"""
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kill = ask_yes_no("Are you sure you want to kill this embedded instance "
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"(y/n)? [y/N] ",'n')
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if kill:
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self.shell.embedded_active = False
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print ("This embedded IPython will not reactivate anymore "
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"once you exit.")
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class InteractiveShellEmbed(TerminalInteractiveShell):
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dummy_mode = Bool(False)
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exit_msg = Unicode('')
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embedded = CBool(True)
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embedded_active = CBool(True)
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# Like the base class display_banner is not configurable, but here it
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# is True by default.
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display_banner = CBool(True)
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exit_msg = Unicode()
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def __init__(self, **kw):
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if kw.get('user_global_ns', None) is not None:
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warnings.warn("user_global_ns has been replaced by user_module. The\
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parameter will be ignored.", DeprecationWarning)
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super(InteractiveShellEmbed,self).__init__(**kw)
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# don't use the ipython crash handler so that user exceptions aren't
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# trapped
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sys.excepthook = ultratb.FormattedTB(color_scheme=self.colors,
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mode=self.xmode,
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call_pdb=self.pdb)
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def init_sys_modules(self):
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pass
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def init_magics(self):
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super(InteractiveShellEmbed, self).init_magics()
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self.register_magics(EmbeddedMagics)
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def __call__(self, header='', local_ns=None, module=None, dummy=None,
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stack_depth=1, global_ns=None, compile_flags=None):
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"""Activate the interactive interpreter.
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__call__(self,header='',local_ns=None,module=None,dummy=None) -> Start
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the interpreter shell with the given local and global namespaces, and
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optionally print a header string at startup.
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The shell can be globally activated/deactivated using the
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dummy_mode attribute. This allows you to turn off a shell used
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for debugging globally.
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However, *each* time you call the shell you can override the current
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state of dummy_mode with the optional keyword parameter 'dummy'. For
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example, if you set dummy mode on with IPShell.dummy_mode = True, you
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can still have a specific call work by making it as IPShell(dummy=False).
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"""
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# If the user has turned it off, go away
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if not self.embedded_active:
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return
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# Normal exits from interactive mode set this flag, so the shell can't
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# re-enter (it checks this variable at the start of interactive mode).
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self.exit_now = False
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# Allow the dummy parameter to override the global __dummy_mode
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if dummy or (dummy != 0 and self.dummy_mode):
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return
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if self.has_readline:
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self.set_readline_completer()
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# self.banner is auto computed
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if header:
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self.old_banner2 = self.banner2
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self.banner2 = self.banner2 + '\n' + header + '\n'
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else:
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self.old_banner2 = ''
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# Call the embedding code with a stack depth of 1 so it can skip over
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# our call and get the original caller's namespaces.
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self.mainloop(local_ns, module, stack_depth=stack_depth,
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global_ns=global_ns, compile_flags=compile_flags)
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self.banner2 = self.old_banner2
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if self.exit_msg is not None:
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print(self.exit_msg)
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def mainloop(self, local_ns=None, module=None, stack_depth=0,
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display_banner=None, global_ns=None, compile_flags=None):
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"""Embeds IPython into a running python program.
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Parameters
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----------
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local_ns, module
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Working local namespace (a dict) and module (a module or similar
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object). If given as None, they are automatically taken from the scope
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where the shell was called, so that program variables become visible.
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stack_depth : int
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How many levels in the stack to go to looking for namespaces (when
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local_ns or module is None). This allows an intermediate caller to
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make sure that this function gets the namespace from the intended
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level in the stack. By default (0) it will get its locals and globals
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from the immediate caller.
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compile_flags
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A bit field identifying the __future__ features
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that are enabled, as passed to the builtin :func:`compile` function.
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If given as None, they are automatically taken from the scope where
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the shell was called.
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"""
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if (global_ns is not None) and (module is None):
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warnings.warn("global_ns is deprecated, use module instead.", DeprecationWarning)
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module = DummyMod()
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module.__dict__ = global_ns
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# Get locals and globals from caller
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if ((local_ns is None or module is None or compile_flags is None)
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and self.default_user_namespaces):
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call_frame = sys._getframe(stack_depth).f_back
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if local_ns is None:
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local_ns = call_frame.f_locals
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if module is None:
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global_ns = call_frame.f_globals
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module = sys.modules[global_ns['__name__']]
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if compile_flags is None:
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compile_flags = (call_frame.f_code.co_flags &
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compilerop.PyCF_MASK)
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# Save original namespace and module so we can restore them after
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# embedding; otherwise the shell doesn't shut down correctly.
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orig_user_module = self.user_module
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orig_user_ns = self.user_ns
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orig_compile_flags = self.compile.flags
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# Update namespaces and fire up interpreter
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# The global one is easy, we can just throw it in
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if module is not None:
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self.user_module = module
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# But the user/local one is tricky: ipython needs it to store internal
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# data, but we also need the locals. We'll throw our hidden variables
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# like _ih and get_ipython() into the local namespace, but delete them
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# later.
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if local_ns is not None:
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self.user_ns = local_ns
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self.init_user_ns()
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# Compiler flags
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if compile_flags is not None:
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self.compile.flags = compile_flags
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# make sure the tab-completer has the correct frame information, so it
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# actually completes using the frame's locals/globals
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self.set_completer_frame()
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with self.builtin_trap, self.display_trap:
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self.interact(display_banner=display_banner)
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# now, purge out the local namespace of IPython's hidden variables.
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if local_ns is not None:
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for name in self.user_ns_hidden:
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local_ns.pop(name, None)
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# Restore original namespace so shell can shut down when we exit.
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self.user_module = orig_user_module
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self.user_ns = orig_user_ns
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self.compile.flags = orig_compile_flags
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def embed(**kwargs):
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"""Call this to embed IPython at the current point in your program.
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The first invocation of this will create an :class:`InteractiveShellEmbed`
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instance and then call it. Consecutive calls just call the already
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created instance.
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If you don't want the kernel to initialize the namespace
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from the scope of the surrounding function,
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and/or you want to load full IPython configuration,
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you probably want `IPython.start_ipython()` instead.
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Here is a simple example::
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from IPython import embed
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a = 10
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b = 20
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embed(header='First time')
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c = 30
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d = 40
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embed()
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Full customization can be done by passing a :class:`Config` in as the
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config argument.
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"""
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config = kwargs.get('config')
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header = kwargs.pop('header', u'')
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compile_flags = kwargs.pop('compile_flags', None)
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if config is None:
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config = load_default_config()
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config.InteractiveShellEmbed = config.TerminalInteractiveShell
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kwargs['config'] = config
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shell = InteractiveShellEmbed.instance(**kwargs)
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shell(header=header, stack_depth=2, compile_flags=compile_flags)
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